Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 21,245	$ (24,507)	$ 10,981	$ (24,753)
Other comprehensive income (loss):
Cumulative translation adjustments	(2,022)	(568)	(2,109)	285
Changes in market value of investments:
Changes in unrealized losses	(49)	(125)	(88)	(67)
Total net change in market value of investments	(49)	(125)	(88)	(67)
Changes in market value of derivatives:
Changes in market value of derivatives, net of tax (benefits) of ($189), ($108), ($242) and ($314), respectively	(299)	(180)	(384)	(492)
Reclassification adjustment for net gains included in net income (loss), net of taxes of $73, $60, $77, and $718, respectively	120	99	127	1,231
Total net change in market value of derivatives	(179)	(81)	(257)	739
Other comprehensive income (loss)	(2,250)	(774)	(2,454)	957
Total comprehensive income (loss)	$ 18,995	$ (25,281)	$ 8,527	$ (23,796)